Process of producing homogeneous, moldable powders from fibrous cements



COATING OR PLASTIC Patented Apr. 13, 1926.

UNITED STATES PATENT OFFICE.

IWAN EMIL LANHOFFER AND OSCAR EDMOND LANHOFFER, 0F IPARIS, FRANCE, AS-SIGNORS TO SIMON J. DANNENBERG OF NEW YORK, N. Y.

PROCESS OF PRODUCING HOMOGENEOUS, MOLDABLE POWDERS FROM FIBROUS CEMENTS.

No Drawing.

1 '0 all whom it may concern Be it known that we, IWAN EMIL LAN- HOFFER,a citizen of the Republic ofFrance,

Application filed March 18, 1925. Serial No. 16,569.

We then use this powder either just as it 4/ and a resident of Paris,France (post o e address 10 Avenue de la Grande Armee), wheel itself canbe used to produce dlrectly and OSCAR EDMOND LANHOFFER, citizen of theRepublic of France, residing at Paris, France (post-ofiice address 10Avenue de la Grande Armee), have invented certaln new and usefulImprovements in a Process of Producing Homogeneous, Moldable Powdersfrom Fibrous Cements, of which the following is a specification.

Whatever the method according to which they are prepared,mortagsflmadeofcement and fibrous materiallia rdly offer absolute homoy. 1 ierto there has been no tvay'to avoid the formation of smallbunches of fibres which when such a mortar is spread out in a singlelayer over a mold plate or other suitable receiving or supportingsurface, will of necessity offer points where bothresistance andadherence are not the same as with the rest of the mass.

The object of our invention is to provide a process permitting absolutehomogeneity to be imparted to such mortars while doing away with theabove mentioned defect.

Such process consists in emovin from a wet mixture of d sintegrated rousma e1 rial and cement constituting tie mortar a form.

like as the best implement to pow'derizesucli mortar, we reserve the rig1 use other means such as cylinders striated like files 0r rasps, steelhushed, warped saws, circular saws inclined on their axis of rotationetc., etc, to achieve analogous effects.

Having now particularly ascertained and described the nature of our saidinvention as well as the manner in which the same is to be performed, wedeclare that what We claim is:-

1. A process of producing homogeneous, moldable powders from fibrouscements, comprising the steps of forming a wet mortar from fibrousmaterial and cement; eggthe mortar into plate or block form to expel s11excesswater'tlieiefrom; and then reducing such plate or block to powderQ. A process of producing homogeneous, moldable powders from fibrouscements, comprising the steps of forming a wet mortar from fibrousmaterial and cement; compressing the mortar into plate or block form toexpel all excess water therefrom; and then subjecting the plate or blockto the action of a rapidly-rotating grinding element to reduce it to theform of a moist powder.

In testimony whereof we afiix our turos.

lWAN EMIL LANHOFFER. OSCAR EDMOND LANHOFFER.

signa-

